[kimdotcom]

This is really not out of the realm of a dedicated hobbyist.

The switches and keycaps can be ordered from quite a few vendors.

Also, custom circuitboards are no longer difficult to design or produce in small quantities (especially separate left/right boards).

Use a Teensy to wire it together as a USB HUD device.

3d print the case.

[metalliqaz]

Shameless plug for my own custom keyboard firmware project: https://github.com/dhowland/EasyAVR

Works with the Teensy

[justwalt]

Thanks for linking this, I’m actually in the design phase of this project right now so the timing couldn’t be better. I’m going to try it some time this week.

[kimdotcom]

So, I used to have a full-size keyboard with a built-in calculator as part of the numpad (had an LCD display above).

I would love to built an updated version.

[eltoozero]

You mean USB HID, Human Interface Device.

[kimdotcom]

Yes. Good catch.